Terminal block for magnetic chucks and the like



Aug. 10 1926. 1,595,691

F. L. SIMMONS TERMINAL BLOCK FOR MAGNETIC caucus AND frat: LIKE Original Filed March 14, 1918 4 Sheets-Sheet 1 Aug. 10 1926.

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AM A S 33 Qbfowwq Aug. 10 1926. 1,595,691

F. L. SIMMONS TERMINAL BLOCK FOR MAGNETIC CHUCKS AND THE LIKE Original Filed March 14, 1918 4 Sheets-Sheet 4 n" h. :1 ll I I II ATTORNEY Patented Aug. 10, 1926.

UNITED STATES 1,595,691 PATENT OFFICE.

FRANK L. SIMMONS, OI WOONSOCKET, RHODE ISLAND, ASSIGNOR TO THE TAFT-PEIRCE MANUFACTURING COMPANY, OF WOONSOCKET, RHODE ISLAND, A CORIOBATION 0F RHODE ISLAND.

TERMINAL BLOCK FOR MAGNETIC CHUCKS AND THE LIKE.

Original application filed March 14, 1918, Serial No. 222.375. Divided and this application filed January 27, 1920. Serial No. 354,372.

Another and further object of the present invention is a terminal block provided with connector plates comprising terminal members to cooperate with a suitable electric switch or housing whereby the switch or housing may be interchanged.

A still further and more particular obiect of the present invention is a terminal block of bakelite or the like carrying four terminals to which the coils of the magnetic chuck are connected. with each of the said terminals provided with rotating arms adapted for connection in such manner that when the arms are connect-ed in one predetermined order the coils of the chuck are in multiple. and when the arms are connected in another predetermined order the coils of the chuck are in series.

Other and further objects of the present" invention will in part be obvious and will in part be pointed out hereinafter in the specification following by reference to the accompanying drawings wherein like parts are represented by like characters through with a flexible cable leading to the chuck.

out the several figures thereof.

Figure 1 is a perspective view of a mag-' netic chuck showing the switch positioned in the front wall.

Figure 2 is a front view of the terminal box in position on the front wall of a magnetic chuck and showing the adjustable terblocks in amanner similar to the connection of the switch with the box.

minal connections arranged in such manner that the coils are in parallel.

Figure 3 is a view similar to Figure 2 with the exception that the connections are arranged in such manner that the coils are in series. I

Figure 4 is a diagrammatic View illustrating the connections as shown in Figure 3.

Figure 5 is a diagrammatic view illustrating the connections as shown in Figure 2. I I

Figure 6 is a view illustrating parts arranged with the switch on a separate board and with a housing over the terminal box.

Figure l demagnetized switch and a front u all of the chuck.

Figure 8 is a diagrammatic view of the groups of pole coils connected in series.

Figure 9 is a View similar to Figure 8 with the groups of coils connected in parallel.

Figure 10 is a cross sectional view showing the internal construction of the chuck and the coils mounted on the respective poles.

Magnetic chucks are necessarily adapted is a sectional view through the portion of the for use on prevailing shop current electricity and it is desirable that the chuck be quickl v available for use on difle'rentvoltages. Standard voltages are either 110 volts or 220 volts, so therefore it is essential that constructions be provided wherein the chuck may be quickly adjusted for effective operation on either of these circuits.

The present invention, among other features, provides for this adjustability by use of a terminal box constructed with adjustable swinging arms that may be suitably connected to quickly provide adjustability whereby the chuck may be used on the particular voltage available. Also certain uses for magnetic chucks make it desirable that the switch be removed from the face of the chuck and mounted on a stationary board Where such change is desirable the present mvention includes provisions whereby the the switch and replace the same by a housinc" which cooperates with the terminal More particularly the present invention comprises a magnetic chuck having a cored opening in the front wall. in which opening is mounted a cupped plate of bakelitm condensite, or suitable material. in which are mounted four terminal posts, each of which is connected with the terminals of the coils of the chuck, and each of which carries connector arms adapted to be arranged so that the coils of the chuck are in series or in multiple as desired for the demands for the required condition. Two of the connector posts are provided with terminal plates which extend upwardly from the cuppeo portion and are adapted to contact with terminals on either a suitable switch or on a housing which may be connected by flexible cable to the switch mounted on a stationary board. The parts are so constructed that when either the switch or the housing is in position over the terminal box the entire construction is waterproof and is therefore adaptable for wet grinding.

Referring now more particularly to the drawings, the magnetic chuck 1 is provided with a protecting sleeve or canopy 2 beneath which is mounted the demagnetizing switch 4 to which is attached a terminal plug 5 that is secured to the waterproof cable 6. The housing 7 of the switch 4 is preferably formed of bakelite and carries suitable switch mechanism including connector posts 8 and 9 that form the contacts between the chuck and the terminal block.

The terminal block is preferably formed of molded bakelit-e or condensite, to comprise a cupped plate 10 that extends through the cored opening 11 in the front wall of the chuck 1. This cupped plate is provided with four stub screws 12, 1 1, 15 and 16, which carry swinging arms 17. 18, 19 and 20. respectively. The coils of the chuck are preferably divided into two equal groups indicated in the diagrammatic Figures 4 and 5 as X and Y. The terminals of the coil X are connected to the stub screws 12 and 15. and the terminals of the coil Y are connected to the stub screws 14 and 16, respectively forming terminal posts for the coils X and Y. The swinging arms are so constructed t?) be connected in one of two ways either with the swinging arms 17 and 18 connected and the arms 19 and 20 connected, whereby the coils are in multiple; or where the arms 18 and 19 are connected and the coils are in series. This construction is of great importance in adapting the chuck to different circuits and these arms are positioned within the cup portion whereby they are securely housed and protected. Small conductor plates 21 and 22 are preferably molded in the bakelite or condensite plate 10 in such manner that the stub screws 12 is threaded into the plate 21 and the stub screw 16 is threaded into the plate 22. Spring terminal plates 24 and 25 are mounted in stub screws 26 and 27 which likewise are threaded. respectively, into the conductor plates 21 and 22 whereby the spring terminal plate 24 is electrically connected with one terminal of the coils X, and the other spring plate terminal 25 is electrically connected with one terminal of the coils Y.

lVhen the connector posts 8 and 9 on the switch 4 are in contact with these terminal plates 24: and 25. it is obvious that the switch is electrically connected with the coils. The

on and off by rotation of the switch han-' dle 31.

It. is often desirable that the switch be located remote from the chuck, as where the chuck is so positioned on a machine as to render the switch inaccessible or where the chuck is used for wet grinding and the switch is submerged in the grinding fluid. Under the circumstances. the switch may be removed without disturbing the terminal block and be placed upon a stationary board 29 as shown in Fig. 6. The base on which the switch rests carries a pair of spring terminal plates (exactly like the plates 2% and 25) which are connected with the lead wires from the feed circuit. The cable 6 is connected with the housing 28 which is mounted upon the chuck and which housing 28. is provided with contact: members 30 and 31 that engage the handle plates 21 and 25. Because of the fact that the terminal spring plates on. the base and on the terminal block are of the same construction and spacing, the parts are interchangeable as to the switch and terminal housing and either may be used upon the terminal block on the chuck, or the base on the board 29.

A preferred form of chuck is shown in section in Fig. 10, wherein a work face is composed of a plurality of face plate pole pieces 36 supported and separated from each other by suitable non-magnetic material 37, which may be aluminum. or the like. A series of pole pieces 38 integral with a base plate 39 and having: magnetizing coils 40 fit snugly against the pole pieces 36 and energize them. The coils are so wound that adjacent pole pieces are of different sign, that is, north and south poles alternate across the face of the chuck. The base of the chuck is enclosed in a casing 41 of nonmagnetic metal which extends around the sides of the chuck and is bolted to the outer periphery of the face plate. A diametrical lay-outof a wiring diagram for such a chuck is shown in Figs. 8 and 9. properly connecting the groups of coils 40 in parallel or in series as hereinbefore described, the chuck may be operated on a voltage of either 110 or 220 volts.

The features of invention more particularly discussed and claimed in this application relate to the terminal box and connec tions, since this application is a division of my prior application, No. 222,375, filed March 14, 1918, now Patent No..1,402,802, dated January 10, 1922. This appiication isalso a continuation as to the arrangement of the electric circuits of my rior application Serial No. 219,237, filed ebruary 26, 1918, Patent No. 1,433,568, dated October 21, 1922.

Realizing that my invention may be embodied in constructions other than those specifically disclosed herewith, I desire that the said disclosure be understood as illustrative and not in a limiting sense.

Having thus described my invention what I claim is:

1. In combination, a magnetic chuck having an opening in the front wall thereof, a terminal block mounted in said opening, a switch mounted over and covering said terminal block, and surface contact members forming the electric circuit between said switch and said terminal block whereby said switch may be removed without disturbing said terminal block.

2. Electrical connections for magnetic chucks and the like comprising a magnetic chuck housing provided with an opening in the front wall thereof, a terminal block mounted within said opening and carrying connections adapted to comprise terminals of the coil for the magnetic chuck, a switch adapted to be mounted over said terminal block and carrying members forming an electrical circuit between the terminal members in said terminal block and said electric switch whereby said switch may be removed without disturbing said terminal block.

3. As an article of manufacture, a terminal block for magnetic crucks and the like, comprising an insulating member, terminal posts carried by said insulating member, contact plates operatively connected with certain of said terminal posts, and movable connectors carried by said terminal posts whereby said connectors may be joined to transmit electric current through said posts either as a single electric circuit or as multipl electric circuits.

4. A terminal block for magnetic chucks and the like, comprising an insulating memher having two terminal posts connected respectively to the terminals for one-half the coils of said chuck, and two other terminal posts connected respectively with the terminals of the other half of the coils of the chuck, terminal plates connected respectively with one member in each pair of terminals, and connector members carried by the terminal posts and adapted to be connected to throw the coils of the chuck either in series, or in multiple, as is desired.

5. As an article of manufacture, a terminal block for magnetic chucks and the like, comprising a base member of a phenolic condensation product, four terminal posts carried by said base member, two ofsaid posts comprising terminals for one-half the coils of the chuck, and the other twoterminal posts comprising terminals for the other connected with certain of said terminal posts.

6. As an article of manufacture, a terminal block for magnetic chucks and the like, a cupped base plate of a phenolic condensation product, terminal posts mounted within said cup and comprising terminals for the coils of the magnetic chuck, connector arms rotatably mounted on the terminal posts and adapted to be connected in such manner that the coils are either in series or in multiple, as is desired.

7 As an article of manufacture, a terminal block comprising an elongated cupped base member of a phenol condensation product, terminal posts mounted within saidcup, connector arms pivoted upon said terminal posts and providedwith screw and slot connections whereby said arms may be connected together in such manner that the coils of the chuck are either in series or in multiple, as is desired, and spring pressed terminal plates operatively connected with certain of said terminal posts.

8. As an article of manufacture, a terminal block for magnetic chucks and the like, comprising a cupped plate of a phenolic condensation product, terminal posts within the cupped portion of said plate, and connector arms for joining said terminal posts, substantially as described.

9. In combination, magnetic chuck having an opening in the front wall thereof, a terminal block having a cupped portion seated in said opening, a housing mounted over and covering the cupped portion of said terminal block, and contact members forming an electric circuit between said housing and said terminal block whereby said housing may be removed without disturbing said terminal block.

10. As an article of manufacture, a terminal block for magnetic chucks and the like comprising a base plate formed of phenol condensation product, terminal posts mounted on said base plate for the coils of the magnetic chuck, and connector arms mount ed on the terminal posts and adapted to be connected in such manner that the coils are either in series or in multiple as desired.

11. In combination, a magnetic chuck having an opening in the front wall thereof, a terminal block mounted in said opening, a housing mounted over said terminal block and contact members forming an electric circuit between said housing and said terminal block whereby said housing may be removed Without disturbing said terminal block.

12. A magnetic chuck comprising a housing, a plurality of energizing coils in said housing, said coils being arranged in groups,

terminal posts mounted on said housing and adapted to be connected to said coils, connecting arms on said terminal posts for interconnecting same as desired, and a cover adapted to fit over and enclose said terminal posts, 

